If you plan on pushing a .223 with any bullets, Rem 7.5's, and CCI BR4's seem to have the strongest cups. I've shot many rounds using WSR primers at pressures I'm sure would make manual writers cringe with no problems, they flatten, but they don't pierce. Many years ago I had problems with Rem 7.5's the failed at the radius of the cup apparently from "bad" cups, and it's something I've never experienced with other primers. Although F205's seem to stand up to high pressures in BR competition in standard actions I've experienced more flattening and cratering with them than any other primers.
Maybe the best thing to do is to assemble loads with the primers that are available to you and try them to see which gives the best accuracy and performance. Takes time and uses up expensive components and barrel life, but it's the sure way to know for yourself.
